You are employed as the network administrator at ABC.com. The ABC.com network has a domain named ABC.com. All servers on the domain run Windows Server 2008 and all client computers run Windows Vista. ABC.com makes use of two WSUS servers named ABC-SR01 and ABC-SR02 configured in a WSUS hierarchy.

On ABC-SR01, how can you make sure that updates can be received from ABC-SR02?

A.
By configuring ABC-SR01 in replica mode.

B.
By creating a new computer group for ABC-SR01.

C.
By opening Control Panel from the Start Menu and configuring Windows Update Settings on ABC-SR01 in the domain group policy.

D.
By opening Control Panel from the Start Menu and configuring Windows Update Settings on ABC-SR01 in the local group policy.

Explanation:
In order to configure WSUS on ABC-SR01 so it can receive updates from ABC- SR02, your first step should be to link the servers by configuring ABC-SR01 as downstream server and ABC-SR02 as upstream server. When you link WSUS servers together, there is an upstream WSUS server and a downstream WSUS server.

Because an upstream WSUS server shares updates, you need to configure and ABC-SR02 as upstream server. There are two ways to link WSUS servers together, Autonomous mode and Replica mode. So you can configure ABC-SR01 in Replica mode.

Reference: Choose a Type of WSUS Deployment/ WSUS server hierarchies

http://technet2.microsoft.com/windowsserver/en/library/12b665bc-07fa-4a4e-aed8-f970efe80c4c1033.mspx?mfr=true